Recent research and development of fiber-optic grating writing technologies for sensing applications

To overcome the adverse circumstance of the fiber-optic gratings designed for communication used in sensing applications,based on the summarization of the general demands and characteristics of the sensing fiber-optic gratings,the writing technologies on several sensing fiber Bragg gratings such as those with good resistance property of high temperature,excellent enhancing/weakening sensitivity and high mechanical strength are described concretely.Then the UV-exposing,mechanical-distorting and IR-laser point-by-point inscripting methods for sensing long period fiber gratings are presented respectively.At last the trend of writing technologies for the sensing fiber-optic gratings is forecasted.